$2\cdot3^3+7$
$2xy^2-6xy^2$
$\frac{dy}{dx}=ysecx$
$\int\frac{\sqrt{1-x^2}}{4x^2}dx$
$3a-7b-2a+5b$
$11\:-\:\left(-3\right)$
$8\left(1-5p\right)+6\left(2p+1\right)$
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